Creating a high-gloss or mirror finish on metal sculptures requires precision and the right techniques. Here are the most common methods used by artists and professionals:

1. Hand Polishing: Using progressively finer abrasives, such as sandpaper or polishing compounds, to remove imperfections and create a smooth, reflective surface. This method is labor-intensive but offers excellent control.

2. Buffing with Power Tools: Rotary tools or buffing wheels with polishing compounds can speed up the process, especially for larger sculptures. Compounds like rouge or diamond paste enhance shine.

3. Electroplating: Applying a thin layer of chrome, nickel, or other metals through an electrochemical process. This not only adds shine but also improves durability and corrosion resistance.

4. Lacquering or Clear Coating: After polishing, a clear protective layer can be applied to maintain the mirror finish and prevent oxidation. UV-resistant coatings are ideal for outdoor sculptures.

5. Chemical Polishing: Immersing the metal in acidic or alkaline solutions to dissolve surface irregularities, resulting in a glossy appearance. This is often used for stainless steel or aluminum.

Each method has its advantages, and the choice depends on the metal type, sculpture size, and desired durability. Combining techniques, such as polishing followed by electroplating, can yield the most striking results.